资料来源 : pyDict

正形贝属

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Orthis \Or"this\ ([^o]r"th[i^]s), n. [NL., fr. Gr. 'orqo`s
   straight.] (Zo["o]l.)
   An extinct genus of Brachiopoda, abundant in the Paleozoic
   rocks.